Pulverizer



Jam. 1940.

R. D. CONWAY PULVERIZER Filed April 26, 1937 2 Sheeisw-Sheet 1 INVENTOR ROBERT D. CONWAY ATTORNEY.

R. D. CONWAY Jan 2, 1940.

PULVERI ZER Filed April 26, 1957 2 Sheets-Sheet 2 INVENTOR. ROBERT D. CONWAY BY 65w, ATTORNEY.

Patented Jan. 2, 1940 PULVERIZER Robert D. Conway, Cedar Rapids, Iowa, assignor to Universal Crusher Company, Cedar Rapids, Iowa, a corporation of Delaware Application April 26, 1937, Serial No. 138,901

7 Claims.

This invention relates to pulverizers or hammer mills and has particular relation to the feeding means for such pulverizers.

In devices of the character herein considered a material to be pulverized is fed through a hopper and into a trough of grate bars beneath rotatin hammers which pulverize the material and discharge it through the grate bars. Perhaps the greatest wear on pulverizers of this 10 character comes at the wall of the hopper at which the material is first struck by the hammers. Although the wall of the hopper at this point may be made of wear resistant material such as molybdenum steel or the like considerable W wear occurs at this point and as soon as the front plate casting which constitutes the front wall.

of the hopper wears down to any extent the abrading effect is transferred to the grate bars which are not intended for the purpose.

It is, therefore, a general object of my invention to provide an adjustable wear plate for pulverizers which may be adjusted to compensate for wear without removing the wall of the hopper,

Another object of my invention is to provide,

in a pulverizer, an adjustable wear plate structure which may be adjusted in or out to the same degree at several points along its length.

Other and further features and objects of my W invention will be more apparent to those skilled in the art upon a consideration of the accompanying drawings and following specification, wherein is disclosed a single exemplary embodiment of the invention, with the understanding,

M however, that such changes may be made therein as fall within the scope of the appended claims without departing from the spirit and scope of the invention.

In said drawings:

tilt Figure 1 is a view partly in section and partly in elevation and taken from one end showing a pulverizer constructed according to one embodiment of my invention.

Figure 2 is a view in section taken along the it line lllf-ll of Figure 1, and

Figure 3 is a view in exploded relation of the wear plate and the portion of the hopper wall with which the wear plate has interfitting connection and showing the means for adjustably o positioning the wear plate.

Referring now to the figures of the drawings,

a device constructed according to a preferred embodiment of my invention is mounted on a base, indicated generally at it and including a 55 right side plate ll, 2. left side plate [2, a front tie plate l3, and rear tie plate ll. Access to the interior of the base is afforded through a front clean-out cover l6 and a rear clean-out cover l1. Pedestals ill on the side plates H and I2 afford support for roller bearings 2| in which the drive shaft 22 is rotatably mounted. The member 23 is a fly-wheel and the member 24 is a drive pulley both of which are keyed to the shaft 22. Outer hammer discs 26 and inner hammer discs 21 are mounted on the shaft 22 within the housing w or base In and are keyed to the shaft by keys 28 to rotate with it. The discs 26 and 21 are slotted as indicated at 29 to receive the hammers 30, the hammers being pivotally engaged in the slots between the discs by means of hammer pins ll 3|, which pass through all of the discs and through one row of hammers, there being a plurality of such rows ofhammers in the machine. In the present case three sets of hammers are shown.

The bottom of the trough, for receiving material being pulverized, is formed by grate bars 32, arranged in semi-cylindricar relation, such that the hammer bars in rotation sweep material across the bars, pulverize it, and push it between the bars. The upper rear portion of the casing is closed by means of a corrugated bade casting 33, which assists in abrading and pulverizing any material which is carried past the grates by the hammers. The baffle casting 33 is supported by means of a rear top plate 3% which is in turn' secured to a hinged casting it. The hinged casting 36 is pivotally engaged to the base NI.

Material is fed into the pulverizer by means of the hopper, indicated generally at 37. This hopper is substantially rectangular in horizontal cross section and is comprised of the rear hopper angle 38, the front side liners 39 and the front plate casting M. 0

Breaker plates t2 and d3 of wear resistant material such as molybdenum steel, are received in a suitable recess in the front plate casting ll and bolted thereto by means of bolts M.

Referring now more particularly to Figures l and 3, the lower portion of the front plate casting ll is provided with a semi-cylindrical, transversely-extending recess or lip indicated at a which is adapted to receive a semi-cylindrical flange 46a of wear plate 46. The wear plate 45 50 increases in thickness toward the bottom edge thereof and this part of the edge is made of the hardest available material since the greatest wear comes at this point. Small ribs 45 are located on the rear of the wear plate 46 and are casting 4| into the flange and the recess thus is adapted to receivea plurality of push blocks 49. In the present instance I preferably employ three push blocks, but obviously any suitable number may be employed to furnish adequate support for the wear plates 46. The semi-cylindrical flange 46a of wear plate 46 is bolted into the recess 4Ia by means of bolts 5|. The openings through the front plate casting 4| are slotted as indicated at 50, to permit the entire wear plate to be oscillated within the recess to permit the lower end to be driven inwardly so that as the face thereof is worn away the wear plate may be moved to maintain the inner face thereof in substantial alignment with the inner faces of the grate bars.

The wear plate is driven inwardly by means of the wear plate adjusting screws 52, lock nuts 53 being employed to lock the adjusting screws in position when the position of the wear plate has been suitably adjusted to compensate for wear.

Other screws 55 are used to hold the plate 46 against the blocks 49 and to pull the plate outwardly.

Several advantages are secured by my wear plate structure. It is unnecessary to replace the entire breaker plate assembly when the lower wearing surfaces become worn. The inner face of the wear plate can always be maintained in proper alignment until it is worn so thin that it r can no longer be used. When one wear plate is worn out the adjusting screws 52 may be withdrawn, the worn wear plate removed by removing the bolts 5|, and a new wear plate substituted. It is to be observed that the breaker plates also are in several sections and thus may be readily replaced. This feature is particularly valuable, because, obviously, the lower of the breaker plates will receive more wear than the upper ones.

Although I have described a specific embodiment of my invention, it is apparent that modifications thereof may be made by those skilled in the art. Such modifications may be made without departing from the spirit and scope of my invention as set forth ,in the appended claims.

I claim as my invention:

1. In a hammer mill, a hopper, a front plate for the hopper the front plate being recessed at the inner face thereof and having an extending hollow flange at the outer face and at the lowermost portion thereof, wear plates secured at the upper portion of the inner recess, another wear plate pivotally secured at its upper edge to a point near the lowermost portion of the recess, a plurality of blocks mounted in the extending flange of the front plate and adapted to support the last named wear plate, and means for adjustably positioning the blocks and the wear plate comprising a plurality of bolt members.

2. In a hammer mill, a hopper including a front plate, the front plate having a hollow flange portion at the lower part thereof, wear plates engaged on the front plate at one portion thereof, another wear plate having means for interfitting pivotal connection with the said front plate at the lower portion thereof, means for adjustably positioning the last named wear plate comprising blockmembers slidingly received in the hollow flange portion of the front plate of the hopper and adjusting screw members threaded through the front plate of the hopper and bearing against the block members.

3. In a pulverizer, a rotary hammer mill, a casing for the hammer mill, a plate forming that portion of the casing at which the initial impact on the material being pulverized occurs, the plate'being recessed for receiving a plurality of wear-resisting plates, wear-resisting plates in the form of 'transversally extended bars, means for securing at least one of the wear bars within the upper portion of the recess, and a means for securing another of the wear plates within the recess at the lower portion of the plates, said securing means including transversally-extending grooves in the plate and a flange at the upper rear portion of the lower wear plate, and means for securing the flanged portion of the plate within the groove to provide for pivotal movement of the lower wear, plate, including a hollow flange at the lower portion of the plate, a block received within the hollow flange and set screws for adjusting the block with reference to the hollow flange.

4. In a hammer mill, a hopper, a front plate for the hopper, the front plate being recessed to furnish mounting surfaces for upper and lower wear plates, at least one upper wear plate secured within the recess of the front plate at the upper portion thereof, a lower wear plate pivotally mounted in the lower portion of the recess,

said lower wear plate being of a thickness gradually increasing from top toward the bottom, and means including block members for supporting the last named wear plate for adjustable positioning thereof.

5. In a hammer mill including a hopper, means for lining a portion of the hopper including at least one breaker plate secured to the wall of the hopper, and means for directing material into the mill and compensating for wear at the wall of the hopper subjected to the greatest abrasive action comprising a wear plate having a semicylindrical flange on the upper outer portion thereof, and the hopper wall having a semi-cylindrical recess to receive the flange of the wear plate, the wear plate being disposed below the breaker plate, and means for adjusting the lower portion of the wear plate in and outabout the pivot formed by thesemi-cylindrical flange in the semi-cylindrical recess and for locking the Wear plate in place including bolts passing through the semi-cylindrical flange and the wall of the recess.

6. In a hammer mill including a hopper, a plurality of abrasion resisting plates disposed one above another on at least one wall of the hopper, means for removably securing the wear plates to the wall of the hopper, the lower wall of the hopper having a horizontally extending, approximately semi-cylindrical recess therein, and the lower plate having a semi-cylindrical flange adapted to be received in the semi-cylindrical recess of the hopper wall, the lower wear plate being adapted to pivot about on the flange within the recess as a pivot, and means for adjustably securing the lower portion of the wear plate to the hopper wall,

7. In a hammer mill including a hopper, a plurality of abrasion resisting plates disposed one above another on at least one wall of the hopper,

means for removably securing the wear plates to the wall of the hopper, the lower wall of the hopper having a horizontally extending, approximately semi-cylindrical recess therein, and the lower plate having a semi-cylindrical flange adapted to be received in the semi-cylindrical recess of the hopper wall, the lower wear plate being adapted to pivot about on the flange within the recess as a pivot, and means for adjustably securing the lower portion of the wear plate to the hopper well, said securing means including a horizontally extending slot in the hopper wall, blocks slidable in and out in the slot, a portion of which blocks bear against the rear face of the lower portion of the wear plate, and bolts for adjustably securing the lower portion of the wear plate and the blocks in position on and in the hopper wall.

ROBERT D. CONWAY. 

